Report/Contribution to a conference proceedings

PUBDB-2016-02949

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Electron Dynamics After the HERA Luminosity Upgrade

Hoffstaetter, G. H. (Corresponding author)

2000
DESY Hamburg

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Please use a persistent id in citations: doi:10.3204/PUBDB-2016-02949

Report No.: DESY-M-00-04ZE

Abstract: DESY is currently working on decreasing the size of the proton beam and of the electron beam in HERA at the collider experiments H1 and ZEUS by moving quadrupoles closer to the interaction points and by increasing their strength. To match the smaller proton beam size, the horizontal electron emittance has to be decreased by changing the damping partition numbers and/or by an increase in the phase advance per FODO cell. Together with reaching design currents, these measures should increase the luminosity of HERA from the current maximum value of 2 to 7.6 $\centerdot$ 10$^{31}$cm$^{-2}$s${-1}$. An increase from the current 60$\circ$ to 72$\circ$ phase advance per FODO cell in both planes which reduces the horizontal emittance from 41 to 30nm and a further reduction to 20nm by a shift of the rf frequency have been analyzed and found to have satisfactory properties in computer simulations both with and without chromatic correction. Experimental tests have been carried out to find whether an increase of the rf frequency reduces the emittance as predicted and whether the current rf frequency is close enough to the center frequency to allow for the required increase. Additionally tests of whether the increased focusing reduces the emittance as predicted and whether the dynamic aperture remains satisfactory in a 72$\circ$ optics havebeen made. Finally, the reduction of the emittance has to lead to an increased specific luminosity and therefore experience with e/p collisions for a 72$\circ$ electron optics will be described.

Keyword(s): talk: Vienna 2000/06/26 ; electron p: storage ring ; electron synchrotron ; luminosity: upgrade ; beam dynamics ; beam emittance ; beam: width ; chromaticity: correction ; DESY HERA Stor

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Contributing Institute(s):

1. M-Bereich (M(-2012))

Research Program(s):

1. No facility / HGF program None (POF1-890) (POF1-890)

Experiment(s):

1. No specific instrument

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Proceedings/Report Decking, W. (Corresponding author)DESY*
Contributions to the 7th European Particle Accelerator Conference EPAC 2000
2000The 7th European Particle Accelerator Conference EPAC 2000, EPAC 2000, ViennaVienna, Austria, 26 Jun 2000 - 30 Jun 20002000-06-262000-06-30 Hamburg : DESY (2000)2000     Fulltext BibTeX | EndNote: XML, Text | RIS

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